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	<div id="pagetitle"><h1>YUI Library Examples: Animation: Reversing an Animation</h1></div>
</div>
<div id="bd">


	<div id="yui-main">
		<div class="yui-b">
		  <div class="yui-ge">
			  <div class="yui-u first example" id="main">

	<h2>Animation: Reversing an Animation</h2>

	<div id="example" class="promo">
	<div class="example-intro">
	<p>This demonstrates how to use the <code>reverse</code> attribute to change the behavior of the animation.</p>
<p> Click the icon in the header to toggle the element's <code>height</code>.</p>

	</div>

	<div class="module example-container ">
			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam">
                <a href="reverse_clean.html" target="_blank">View example in new window.</a>
            </p>
		</div>		<div id="example-canvas" class="bd">

	
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->

	    
<div id="demo" class="yui3-module">
    <div class="yui3-hd">
        <h4>Animation Demo</h4>
    </div>
    <div class="yui3-bd">
        <p>This an example of what you can do with the YUI Animation Utility.</p>
        <p><em>Follow the instructions above to see the animation in action.</em></p>
    </div>
</div>
<p>This is placeholder text used to demonstrate how the above animation affects subsequent content.</p> 
<script type="text/javascript">
YUI({ filter: 'raw' }).use("node", "anim", function(Y) {
    var module = Y.one('#demo');

    // add fx plugin to module body
    var content = module.one('.yui3-bd').plug(Y.Plugin.NodeFX, {
        from: { height: 1 },
        to: {
            height: function(node) { // dynamic in case of change
                return node.get('scrollHeight'); // get expanded height (offsetHeight may be zero)
            }
        },

        easing: Y.Easing.easeOut,
        duration: 0.5
    });

    var onClick = function(e) {
        module.toggleClass('yui3-closed');
        content.fx.set('reverse', !content.fx.get('reverse')); // toggle reverse 
        content.fx.run();
    };

    // use dynamic control for dynamic behavior
    var control = Y.Node.create(
        '<a title="show/hide content" class="yui3-toggle">' +
            '<em>toggle</em>' +
        '</a>'
    );

    // append dynamic control to header section
    module.one('.yui3-hd').appendChild(control);
    control.on('click', onClick);

});

</script>

	<!--END SOURCE CODE FOR EXAMPLE =============================== -->

	
		</div>
	</div>
	</div>

	<h3>Setting up the HTML</h3>
<p>First we add some HTML to animate.</p>
<div id="syntax-cd2d9f2d93e89ed9491d2a3be3dcc402" class="yui-syntax-highlight"><div class="numbers"><pre class="html4strict" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="sc2">&lt;<span class="kw2">div</span> <span class="kw3">id</span><span class="sy0">=</span><span class="st0">&quot;demo&quot;</span> <span class="kw3">class</span><span class="sy0">=</span><span class="st0">&quot;yui3-module&quot;</span>&gt;</span></div></li><li class="li1"><div class="de1">    <span class="sc2">&lt;<span class="kw2">div</span> <span class="kw3">class</span><span class="sy0">=</span><span class="st0">&quot;yui3-hd&quot;</span>&gt;</span></div></li><li class="li1"><div class="de1">        <span class="sc2">&lt;<span class="kw2">h4</span>&gt;</span>Animation Demo<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">h4</span>&gt;</span></div></li><li class="li1"><div class="de1">        <span class="sc2">&lt;<span class="kw2">a</span> <span class="kw3">title</span><span class="sy0">=</span><span class="st0">&quot;remove module&quot;</span> <span class="kw3">class</span><span class="sy0">=</span><span class="st0">&quot;yui3-toggle&quot;</span>&gt;&lt;<span class="kw2">em</span>&gt;</span>-<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">em</span>&gt;&lt;<span class="sy0">/</span><span class="kw2">a</span>&gt;</span></div></li><li class="li2"><div class="de2">    <span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">div</span>&gt;</span></div></li><li class="li1"><div class="de1">    <span class="sc2">&lt;<span class="kw2">div</span> <span class="kw3">class</span><span class="sy0">=</span><span class="st0">&quot;yui3-bd&quot;</span>&gt;</span></div></li><li class="li1"><div class="de1">        <span class="sc2">&lt;<span class="kw2">p</span>&gt;</span>This an example of what you can do with the YUI Animation Utility.<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">p</span>&gt;</span></div></li><li class="li1"><div class="de1">        <span class="sc2">&lt;<span class="kw2">p</span>&gt;&lt;<span class="kw2">em</span>&gt;</span>Follow the instructions above to see the animation in action.<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">em</span>&gt;&lt;<span class="sy0">/</span><span class="kw2">p</span>&gt;</span></div></li><li class="li1"><div class="de1">    <span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">div</span>&gt;</span></div></li><li class="li2"><div class="de2"><span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">div</span>&gt;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="html4strict" style="font-family:monospace;"><span class="sc2">&lt;<span class="kw2">div</span> <span class="kw3">id</span><span class="sy0">=</span><span class="st0">&quot;demo&quot;</span> <span class="kw3">class</span><span class="sy0">=</span><span class="st0">&quot;yui3-module&quot;</span>&gt;</span>
    <span class="sc2">&lt;<span class="kw2">div</span> <span class="kw3">class</span><span class="sy0">=</span><span class="st0">&quot;yui3-hd&quot;</span>&gt;</span>
        <span class="sc2">&lt;<span class="kw2">h4</span>&gt;</span>Animation Demo<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">h4</span>&gt;</span>
        <span class="sc2">&lt;<span class="kw2">a</span> <span class="kw3">title</span><span class="sy0">=</span><span class="st0">&quot;remove module&quot;</span> <span class="kw3">class</span><span class="sy0">=</span><span class="st0">&quot;yui3-toggle&quot;</span>&gt;&lt;<span class="kw2">em</span>&gt;</span>-<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">em</span>&gt;&lt;<span class="sy0">/</span><span class="kw2">a</span>&gt;</span>
    <span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">div</span>&gt;</span>
    <span class="sc2">&lt;<span class="kw2">div</span> <span class="kw3">class</span><span class="sy0">=</span><span class="st0">&quot;yui3-bd&quot;</span>&gt;</span>
        <span class="sc2">&lt;<span class="kw2">p</span>&gt;</span>This an example of what you can do with the YUI Animation Utility.<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">p</span>&gt;</span>
        <span class="sc2">&lt;<span class="kw2">p</span>&gt;&lt;<span class="kw2">em</span>&gt;</span>Follow the instructions above to see the animation in action.<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">em</span>&gt;&lt;<span class="sy0">/</span><span class="kw2">p</span>&gt;</span>
    <span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">div</span>&gt;</span>
<span class="sc2">&lt;<span class="sy0">/</span><span class="kw2">div</span>&gt;</span></pre></div><textarea id="syntax-cd2d9f2d93e89ed9491d2a3be3dcc402-plain"><div id="demo" class="yui3-module">
    <div class="yui3-hd">
        <h4>Animation Demo</h4>
        <a title="remove module" class="yui3-toggle"><em>-</em></a>
    </div>
    <div class="yui3-bd">
        <p>This an example of what you can do with the YUI Animation Utility.</p>
        <p><em>Follow the instructions above to see the animation in action.</em></p>
    </div>
</div></textarea></div>
<h3>Using the NodeFX Plugin</h3>
<p>For this example, we will use <code>Node</code>'s <code>fx</code> plugin to animate the element.  The plugin adds the anim instance to the <code>Node</code> instance, pre-configuring it to use the Node instance as the <code>Anim</code>'s node.  The <code>plug</code> method accepts a class to construct and an optional config to pass to the constructor.</p>
<p>Setting the <code>from</code> attribute to the expanded height of the element allows us to toggle the effect using the <code>reverse</code> attribute, which we will see below (<code>from</code> uses current value when omitted).</p>

<div id="syntax-0e50c0e9300060b44098301b7ed1d195" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="kw2">var</span> module <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'#demo'</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1"><span class="co1">// add fx plugin to module body</span></div></li><li class="li1"><div class="de1"><span class="kw2">var</span> content <span class="sy0">=</span> module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-bd'</span><span class="br0">&#41;</span>.<span class="me1">plug</span><span class="br0">&#40;</span>Y.<span class="me1">Plugin</span>.<span class="me1">NodeFX</span><span class="sy0">,</span> <span class="br0">&#123;</span></div></li><li class="li2"><div class="de2">    from<span class="sy0">:</span> <span class="br0">&#123;</span> height<span class="sy0">:</span> <span class="nu0">0</span> <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    to<span class="sy0">:</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">        height<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">&#40;</span>node<span class="br0">&#41;</span> <span class="br0">&#123;</span> <span class="co1">// dynamic in case of change</span></div></li><li class="li1"><div class="de1">            <span class="kw1">return</span> node.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'scrollHeight'</span><span class="br0">&#41;</span><span class="sy0">;</span> <span class="co1">// get expanded height (offsetHeight may be zero)</span></div></li><li class="li1"><div class="de1">        <span class="br0">&#125;</span></div></li><li class="li2"><div class="de2">    <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">    easing<span class="sy0">:</span> Y.<span class="me1">Easing</span>.<span class="me1">easeOut</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    from<span class="sy0">:</span> <span class="br0">&#123;</span> height<span class="sy0">:</span> <span class="nu0">0</span> <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    duration<span class="sy0">:</span> <span class="nu0">0.5</span></div></li><li class="li2"><div class="de2"><span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="kw2">var</span> module <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'#demo'</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
<span class="co1">// add fx plugin to module body</span>
<span class="kw2">var</span> content <span class="sy0">=</span> module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-bd'</span><span class="br0">&#41;</span>.<span class="me1">plug</span><span class="br0">&#40;</span>Y.<span class="me1">Plugin</span>.<span class="me1">NodeFX</span><span class="sy0">,</span> <span class="br0">&#123;</span>
    from<span class="sy0">:</span> <span class="br0">&#123;</span> height<span class="sy0">:</span> <span class="nu0">0</span> <span class="br0">&#125;</span><span class="sy0">,</span>
    to<span class="sy0">:</span> <span class="br0">&#123;</span>
        height<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">&#40;</span>node<span class="br0">&#41;</span> <span class="br0">&#123;</span> <span class="co1">// dynamic in case of change</span>
            <span class="kw1">return</span> node.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'scrollHeight'</span><span class="br0">&#41;</span><span class="sy0">;</span> <span class="co1">// get expanded height (offsetHeight may be zero)</span>
        <span class="br0">&#125;</span>
    <span class="br0">&#125;</span><span class="sy0">,</span>
&nbsp;
    easing<span class="sy0">:</span> Y.<span class="me1">Easing</span>.<span class="me1">easeOut</span><span class="sy0">,</span>
    from<span class="sy0">:</span> <span class="br0">&#123;</span> height<span class="sy0">:</span> <span class="nu0">0</span> <span class="br0">&#125;</span><span class="sy0">,</span>
    duration<span class="sy0">:</span> <span class="nu0">0.5</span>
<span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-0e50c0e9300060b44098301b7ed1d195-plain">var module = Y.one('#demo');

// add fx plugin to module body
var content = module.one('.yui3-bd').plug(Y.Plugin.NodeFX, {
    from: { height: 0 },
    to: {
        height: function(node) { // dynamic in case of change
            return node.get('scrollHeight'); // get expanded height (offsetHeight may be zero)
        }
    },

    easing: Y.Easing.easeOut,
    from: { height: 0 },
    duration: 0.5
});</textarea></div>
<h3>Creating the Control Element</h3>
<p>Because our behavior only works when JS is available, let's go ahead and add our control element using JS as well.</p>

<div id="syntax-fa86a024d818a0c1bc44188127fa06a0" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="co1">// use dynamic control for dynamic behavior</span></div></li><li class="li1"><div class="de1"><span class="kw2">var</span> control <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">create</span><span class="br0">&#40;</span></div></li><li class="li1"><div class="de1">    <span class="st0">'&lt;a title=&quot;show/hide content&quot; class=&quot;yui3-toggle&quot;&gt;'</span> <span class="sy0">+</span></div></li><li class="li1"><div class="de1">        <span class="st0">'&lt;em&gt;toggle&lt;/em&gt;'</span> <span class="sy0">+</span></div></li><li class="li2"><div class="de2">    <span class="st0">'&lt;/a&gt;'</span></div></li><li class="li1"><div class="de1"><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1"><span class="co1">// append dynamic control to header section</span></div></li><li class="li1"><div class="de1">module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-hd'</span><span class="br0">&#41;</span>.<span class="me1">appendChild</span><span class="br0">&#40;</span>control<span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="co1">// use dynamic control for dynamic behavior</span>
<span class="kw2">var</span> control <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">create</span><span class="br0">&#40;</span>
    <span class="st0">'&lt;a title=&quot;show/hide content&quot; class=&quot;yui3-toggle&quot;&gt;'</span> <span class="sy0">+</span>
        <span class="st0">'&lt;em&gt;toggle&lt;/em&gt;'</span> <span class="sy0">+</span>
    <span class="st0">'&lt;/a&gt;'</span>
<span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
<span class="co1">// append dynamic control to header section</span>
module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-hd'</span><span class="br0">&#41;</span>.<span class="me1">appendChild</span><span class="br0">&#40;</span>control<span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-fa86a024d818a0c1bc44188127fa06a0-plain">// use dynamic control for dynamic behavior
var control = Y.Node.create(
    '<a title="show/hide content" class="yui3-toggle">' +
        '<em>toggle</em>' +
    '</a>'
);

// append dynamic control to header section
module.one('.yui3-hd').appendChild(control);</textarea></div><h3>Toggling Animation Behavior</h3>
<p>Before calling <code>run</code> in our <code>click</code> handler, we will use the <code>reverse</code> attribute toggle the direction of the animation depending on whether its opening or closing.</p>

<div id="syntax-09f6c4c2c1dcf4fe6eecaa0753af751d" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="kw2">var</span> onClick <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>e<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">    module.<span class="me1">toggleClass</span><span class="br0">&#40;</span><span class="st0">'yui-closed'</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">    content.<span class="me1">fx</span>.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">'reverse'</span><span class="sy0">,</span> <span class="sy0">!</span>content.<span class="me1">fx</span>.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'reverse'</span><span class="br0">&#41;</span><span class="br0">&#41;</span><span class="sy0">;</span> <span class="co1">// toggle reverse</span></div></li><li class="li1"><div class="de1"><span class="br0">&#125;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="kw2">var</span> onClick <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>e<span class="br0">&#41;</span> <span class="br0">&#123;</span>
    module.<span class="me1">toggleClass</span><span class="br0">&#40;</span><span class="st0">'yui-closed'</span><span class="br0">&#41;</span><span class="sy0">;</span>
    content.<span class="me1">fx</span>.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">'reverse'</span><span class="sy0">,</span> <span class="sy0">!</span>content.<span class="me1">fx</span>.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'reverse'</span><span class="br0">&#41;</span><span class="br0">&#41;</span><span class="sy0">;</span> <span class="co1">// toggle reverse</span>
<span class="br0">&#125;</span><span class="sy0">;</span></pre></div><textarea id="syntax-09f6c4c2c1dcf4fe6eecaa0753af751d-plain">var onClick = function(e) {
    module.toggleClass('yui-closed');
    content.fx.set('reverse', !content.fx.get('reverse')); // toggle reverse
};</textarea></div>
<h3>Running the Animation</h3>
<p>Finally we add an event handler to run the animation.</p>
<div id="syntax-2c330d3ee471a1fceb46db240ff1587c" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1">module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-toggle'</span><span class="br0">&#41;</span>.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">'click'</span><span class="sy0">,</span> onClick<span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;">module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-toggle'</span><span class="br0">&#41;</span>.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">'click'</span><span class="sy0">,</span> onClick<span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-2c330d3ee471a1fceb46db240ff1587c-plain">module.one('.yui3-toggle').on('click', onClick);</textarea></div>
<h3>Full Script Source</h3>
<div id="syntax-fa55d1937b09d4ca9f358cb8c0b0e8ee" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1">YUI<span class="br0">&#40;</span><span class="br0">&#41;</span>.<span class="kw2">use</span><span class="br0">&#40;</span><span class="st0">'anim'</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">&#40;</span>Y<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">    <span class="kw2">var</span> module <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'#demo'</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">    <span class="co1">// add fx plugin to module body</span></div></li><li class="li2"><div class="de2">    <span class="kw2">var</span> content <span class="sy0">=</span> module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-bd'</span><span class="br0">&#41;</span>.<span class="me1">plug</span><span class="br0">&#40;</span>Y.<span class="me1">Plugin</span>.<span class="me1">NodeFX</span><span class="sy0">,</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">        from<span class="sy0">:</span> <span class="br0">&#123;</span> height<span class="sy0">:</span> <span class="nu0">0</span> <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">        to<span class="sy0">:</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">            height<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">&#40;</span>node<span class="br0">&#41;</span> <span class="br0">&#123;</span> <span class="co1">// dynamic in case of change</span></div></li><li class="li1"><div class="de1">                <span class="kw1">return</span> node.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'scrollHeight'</span><span class="br0">&#41;</span><span class="sy0">;</span> <span class="co1">// get expanded height (offsetHeight may be zero)</span></div></li><li class="li2"><div class="de2">            <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">        <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">        easing<span class="sy0">:</span> Y.<span class="me1">Easing</span>.<span class="me1">easeOut</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">        duration<span class="sy0">:</span> <span class="nu0">0.5</span></div></li><li class="li2"><div class="de2">    <span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">    <span class="kw2">var</span> onClick <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>e<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">        module.<span class="me1">toggleClass</span><span class="br0">&#40;</span><span class="st0">'yui-closed'</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">        content.<span class="me1">fx</span>.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">'reverse'</span><span class="sy0">,</span> <span class="sy0">!</span>content.<span class="me1">fx</span>.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'reverse'</span><span class="br0">&#41;</span><span class="br0">&#41;</span><span class="sy0">;</span> <span class="co1">// toggle reverse</span></div></li><li class="li2"><div class="de2">        content.<span class="me1">fx</span>.<span class="me1">run</span><span class="br0">&#40;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">    <span class="br0">&#125;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">    <span class="co1">// use dynamic control for dynamic behavior</span></div></li><li class="li1"><div class="de1">    <span class="kw2">var</span> control <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">create</span><span class="br0">&#40;</span></div></li><li class="li2"><div class="de2">        <span class="st0">'&lt;a title=&quot;show/hide content&quot; class=&quot;yui3-toggle&quot;&gt;'</span> <span class="sy0">+</span></div></li><li class="li1"><div class="de1">            <span class="st0">'&lt;em&gt;toggle&lt;/em&gt;'</span> <span class="sy0">+</span></div></li><li class="li1"><div class="de1">        <span class="st0">'&lt;/a&gt;'</span></div></li><li class="li1"><div class="de1">    <span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li2"><div class="de2">    <span class="co1">// append dynamic control to header section</span></div></li><li class="li1"><div class="de1">    module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-hd'</span><span class="br0">&#41;</span>.<span class="me1">appendChild</span><span class="br0">&#40;</span>control<span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">    control.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">'click'</span><span class="sy0">,</span> onClick<span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"><span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;">YUI<span class="br0">&#40;</span><span class="br0">&#41;</span>.<span class="kw2">use</span><span class="br0">&#40;</span><span class="st0">'anim'</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">&#40;</span>Y<span class="br0">&#41;</span> <span class="br0">&#123;</span>
    <span class="kw2">var</span> module <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'#demo'</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
    <span class="co1">// add fx plugin to module body</span>
    <span class="kw2">var</span> content <span class="sy0">=</span> module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-bd'</span><span class="br0">&#41;</span>.<span class="me1">plug</span><span class="br0">&#40;</span>Y.<span class="me1">Plugin</span>.<span class="me1">NodeFX</span><span class="sy0">,</span> <span class="br0">&#123;</span>
        from<span class="sy0">:</span> <span class="br0">&#123;</span> height<span class="sy0">:</span> <span class="nu0">0</span> <span class="br0">&#125;</span><span class="sy0">,</span>
        to<span class="sy0">:</span> <span class="br0">&#123;</span>
            height<span class="sy0">:</span> <span class="kw2">function</span><span class="br0">&#40;</span>node<span class="br0">&#41;</span> <span class="br0">&#123;</span> <span class="co1">// dynamic in case of change</span>
                <span class="kw1">return</span> node.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'scrollHeight'</span><span class="br0">&#41;</span><span class="sy0">;</span> <span class="co1">// get expanded height (offsetHeight may be zero)</span>
            <span class="br0">&#125;</span>
        <span class="br0">&#125;</span><span class="sy0">,</span>
&nbsp;
        easing<span class="sy0">:</span> Y.<span class="me1">Easing</span>.<span class="me1">easeOut</span><span class="sy0">,</span>
        duration<span class="sy0">:</span> <span class="nu0">0.5</span>
    <span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
    <span class="kw2">var</span> onClick <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>e<span class="br0">&#41;</span> <span class="br0">&#123;</span>
        module.<span class="me1">toggleClass</span><span class="br0">&#40;</span><span class="st0">'yui-closed'</span><span class="br0">&#41;</span><span class="sy0">;</span>
        content.<span class="me1">fx</span>.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">'reverse'</span><span class="sy0">,</span> <span class="sy0">!</span>content.<span class="me1">fx</span>.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'reverse'</span><span class="br0">&#41;</span><span class="br0">&#41;</span><span class="sy0">;</span> <span class="co1">// toggle reverse</span>
        content.<span class="me1">fx</span>.<span class="me1">run</span><span class="br0">&#40;</span><span class="br0">&#41;</span><span class="sy0">;</span>
    <span class="br0">&#125;</span><span class="sy0">;</span>
&nbsp;
    <span class="co1">// use dynamic control for dynamic behavior</span>
    <span class="kw2">var</span> control <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">create</span><span class="br0">&#40;</span>
        <span class="st0">'&lt;a title=&quot;show/hide content&quot; class=&quot;yui3-toggle&quot;&gt;'</span> <span class="sy0">+</span>
            <span class="st0">'&lt;em&gt;toggle&lt;/em&gt;'</span> <span class="sy0">+</span>
        <span class="st0">'&lt;/a&gt;'</span>
    <span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
    <span class="co1">// append dynamic control to header section</span>
    module.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">'.yui3-hd'</span><span class="br0">&#41;</span>.<span class="me1">appendChild</span><span class="br0">&#40;</span>control<span class="br0">&#41;</span><span class="sy0">;</span>
    control.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">'click'</span><span class="sy0">,</span> onClick<span class="br0">&#41;</span><span class="sy0">;</span>
<span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-fa55d1937b09d4ca9f358cb8c0b0e8ee-plain">YUI().use('anim', function(Y) {
    var module = Y.one('#demo');

    // add fx plugin to module body
    var content = module.one('.yui3-bd').plug(Y.Plugin.NodeFX, {
        from: { height: 0 },
        to: {
            height: function(node) { // dynamic in case of change
                return node.get('scrollHeight'); // get expanded height (offsetHeight may be zero)
            }
        },

        easing: Y.Easing.easeOut,
        duration: 0.5
    });

    var onClick = function(e) {
        module.toggleClass('yui-closed');
        content.fx.set('reverse', !content.fx.get('reverse')); // toggle reverse
        content.fx.run();
    };

    // use dynamic control for dynamic behavior
    var control = Y.Node.create(
        '<a title="show/hide content" class="yui3-toggle">' +
            '<em>toggle</em>' +
        '</a>'
    );

    // append dynamic control to header section
    module.one('.yui3-hd').appendChild(control);
    control.on('click', onClick);
});</textarea></div>				</div>
				<div class="yui-u sidebar">
	
					<div id="examples" class="mod box4">
                        <div class="hd">
						<h4>
    Animation Examples:</h4>
                        </div>
						<div class="bd">
							<ul>
								<li><a href='../anim/basic.html'>Basic Animation</a></li><li><a href='../anim/easing.html'>Animation Easing</a></li><li><a href='../anim/colors.html'>Animating Colors</a></li><li><a href='../anim/alt-iterations.html'>Alternating Iterations</a></li><li><a href='../anim/anim-xy.html'>Animating XY Position</a></li><li><a href='../anim/curve.html'>Animating Along a Curved Path</a></li><li><a href='../anim/scroll.html'>Animated Scrolling</a></li><li class='selected'><a href='../anim/reverse.html'>Reversing an Animation</a></li><li><a href='../anim/end-event.html'>Using the End Event</a></li><li><a href='../anim/anim-chaining.html'>Chaining Animations Using the <code>end</code> Event</a></li><li><a href='../overlay/overlay-anim-plugin.html'>Animation Plugin (included with examples for Overlay)</a></li><li><a href='../async-queue/queue_app.html'>Building a UI with AsyncQueue (included with examples for AsyncQueue)</a></li>							</ul>
						</div>
					</div>

					<div class="mod box4">
                        <div class="hd">
						<h4>More Animation Resources:</h4>
                        </div>
                        <div class="bd">
						<ul>
							<!-- <li><a href="http://developer.yahoo.com/yui/anim/">User's Guide</a> (external)</li> -->
<li><a href="../../api/module_anim.html">API Documentation</a></li></ul>
                        </div>
					</div>
			  </div>
		</div>

		</div>
	</div>


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